CN107685140A - A kind of method for reducing tundish covering flux consumption - Google Patents
A kind of method for reducing tundish covering flux consumption Download PDFInfo
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- CN107685140A CN107685140A CN201710806277.7A CN201710806277A CN107685140A CN 107685140 A CN107685140 A CN 107685140A CN 201710806277 A CN201710806277 A CN 201710806277A CN 107685140 A CN107685140 A CN 107685140A
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- coverture
- tundish
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- covering flux
- steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to a kind of method for reducing tundish covering flux consumption, belong to metallurgical technology field.Including step：1）Molten steel is injected into tundish；2）Lower coverture is added into tundish, for keeping liquid steel temperature, prevents secondary oxidation of steel；3）Upper coverture is added into tundish, for keeping the temperature of lower coverture, prevents lower coverture surface crust.In low-carbon low-silicon steel production process, the upper coverture such as low carbonization rice husk of use cost is covered in the high lower coverture of cost, it can prevent lower coverture surface from encrustation phenomena occurs, strand slag inclusion problem caused by avoiding lower coverture crust, and the usage amount of coverture under high cost is reduced, reduces manufacturing cost.
Description
Technical field
The present invention relates to metallurgical technology field, more particularly to a kind of method for reducing tundish covering flux consumption.
Background technology
In continuous casting casting cycle, to reduce Metal in Tundish temperature drop, preventing secondary oxidation of steel, it is necessary in tundish
Coverture is added to protect the molten steel in tundish.Tundish covering flux, which can play adiabatic heat-insulation, prevents the work of radiating
With, and air can be completely cut off, prevent the oxygen in air from entering molten steel, prevent molten steel from secondary oxidation occurs.Especially in alkalescence
Between covering agent can play a part of absorbing the non-metallic inclusion purification molten steel that molten steel floats up to liquid steel level, and cover
Agent is not reacted with molten steel, avoids polluting molten steel.But in casting cycle, the phase easily exists alkaline tundish covering flux after pouring
Crusted around stopper, influence the lifting of stopper, cause liquid level fluctuation of crystallizer, easily cause strand slag inclusion.
In low-carbon low-silicon steel production process, using eight machines eight flow billet caster, because fluxion is more, tundish compared with
Long, in the casting cycle later stage, tundish covering flux has encrustation phenomena at stopper, have impact on the lifting of stopper, causes crystallizer
Liquid fluctuating, cause strand slag inclusion.And improve manufacture, it is necessary to consume substantial amounts of tundish covering flux in casting process
Cost.
The content of the invention
The technical problem to be solved in the present invention is for above-mentioned prior art in continuous casting casting cycle, is coated among alkalescence
The phase easily crusts around stopper after pouring for lid agent, and coverture consumption is big, the high deficiency of manufacturing cost, there is provided a kind of
The method for reducing tundish covering flux consumption.
In order to solve the above technical problems, the technical solution used in the present invention is：One kind reduces tundish covering flux consumption
The method of amount, including step：
1）Molten steel is injected into tundish；
2）Lower coverture is added into tundish, for keeping liquid steel temperature, secondary oxidation of steel is prevented, purifies molten steel；
3）Upper coverture is added into tundish, for keeping the temperature of lower coverture, prevents lower coverture surface crust.
Further, the liquid steel level in the tundish is highly more than 400mm；The liquid level refers to tundish bottom
Portion to liquid steel level distance.
Further, the step 2）Including：
21）Lower coverture is added for the first time, and lower coverture is added from tundish middle part to tundish both sides；
22）The lower coverture of second of addition, under being added in first time after coverture, treats that liquid steel level is steady, naked to liquid steel level
Dew or lower coverture non-uniform areas supplement add lower coverture, to liquid steel level completely by lower coverture uniform fold.
Further, the upper coverture usage amount is the 30% of the lower coverture and the upper coverture quality total amount.
Further, the upper coverture is carbonization rice husk, C mass accounting 51.4% in the carbonization rice husk composition,
Si02Quality accounting 27.2%.
Further, the lower coverture composition quality accounting is CaO 27-33%, SiO2 29-35%、Al2O3 9-
13%、MgO 3-5%、C 2-4%、H2O≤0.5%。
Further, the usage amount that the first time adds lower coverture is 2-2.5kg/t；Covered under second of addition
The usage amount of lid agent is 0.8-1.25kg/t.
Further, the usage amount of the upper coverture is 1.0-1.6kg/t.
It is using beneficial effect caused by above-mentioned technical proposal：The a kind of of the present invention reduces tundish covering flux consumption
The method of amount, in low-carbon low-silicon steel production process, it is high that the upper coverture such as low carbonization rice husk of use cost is covered in cost
Lower coverture, it can prevent lower coverture surface from encrustation phenomena occurs, strand slag inclusion caused by avoiding lower coverture crust is asked
Topic, and the usage amount of coverture under high cost is reduced, reduce manufacturing cost.
Brief description of the drawings
Fig. 1 is that the present invention is that the method flow diagram of tundish covering flux consumption is reduced in one embodiment of the invention.
Embodiment
In order that technical problems, technical solutions and advantages to be solved are more clearly understood, tie below
Drawings and Examples are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
Fig. 1 is refer to, Fig. 1 is the method flow diagram that tundish covering flux consumption is reduced in one embodiment of the invention.
The method for reducing tundish covering flux consumption, including step：
1）Molten steel is injected into tundish；
2）Lower coverture is added into tundish, for keeping liquid steel temperature, secondary oxidation of steel is prevented, purifies molten steel；
3）Upper coverture is added into tundish, for keeping the temperature of lower coverture, prevents lower coverture surface crust.
In step 1）In, it is necessary into tundish inject liquid steel level be highly more than 400mm, during the liquid level refers to
Between wrap bottom to liquid steel level distance.In casting cycle, if when Metal in Tundish liquid level is not up to 400mm, just add
Coverture, coverture easily cause clogging of tundish nozzle, influence continuous casting and open the progress of pouring；Secondly as liquid steel level is relatively low, cover
Lid agent easily enters in crystallizer with molten steel, increases the probability of Crystallizer bleed-out, causes production steel product quality to be affected.For
After above mentioned problem is avoided the occurrence of, it is necessary to which the liquid steel level in tundish is highly more than 400mm, coverture is added.
Step 2）Include：
21）Lower coverture is added for the first time, and lower coverture is added from tundish middle part to tundish both sides；
22）The lower coverture of second of addition, under being added in first time after coverture, treats that liquid steel level is steady, naked to liquid steel level
Dew or the uneven place's supplement of lower coverture add lower coverture, to liquid steel level completely by lower coverture uniform fold.
In step 21）In, after the liquid steel level in tundish is more than 400mm, the liquid steel level first into tundish
Coverture under secondary addition.The usage amount for adding lower coverture for the first time is 2-2.5kg/t.Due to the flow velocity of molten steel be not at the uniform velocity,
So occur that lower coverture disperses uneven situation during coverture under addition, so adding the use of coverture
Amount has fluctuation according to deployment conditions.Because molten steel depth is relatively low, now molten steel passes through the shunting action of tundish current stabilizer, steel
Water is filled from tundish middle part to both sides, and so-called tundish current stabilizer refers to that being arranged on tundish bottom is used for stablizing tundish water
Mouth region domain MOLTEN STEEL FLOW, promote inclusion floating, reduce the fire-proofing of molten steel splash.So it should use along MOLTEN STEEL FLOW side
To gradually adding coverture to the mode of both sides in the middle part of the tundish, the coverture of addition can be made to be uniformly dispersed in molten steel
Liquid level.
In step 22）In, under being added in first time after coverture, treat that liquid steel level is steady, liquid steel level checked,
If exposed region or coverture thinner region occurs in liquid steel level, need the region to be carried out second covering under adding
Agent, until the completely capped agent of liquid steel level uniformly covers.Second of usage amount for adding lower coverture is 0.8-1.25kg/
T, after adding lower coverture according to first time, liquid steel level coverage condition, second of usage amount for adding lower coverture has ripple
It is dynamic.Avoid molten steel due to coverture it is uneven caused by locally there is the too fast crust of radiating, or occur with air contact secondary
The problems such as oxidation.
In step 3）In, coverture is added on lower coverture, the upper coverture can be carbonization rice husk, upper covering
The usage amount of agent is 1.0-1.6kg/t, during adding carbonization rice husk, because the liquid steel level in tundish is steady,
Using from tundish both sides gradually to adding by the way of middle part.It can make that carbonization rice husk is quick, is uniformly covered on lower coverture
Surface.Due to the high insulating effect of carbonization rice husk, it can be ensured that encrustation phenomena does not occur in casting cycle for lower coverture.
And due to adding carbonization rice husk, the usage amount of lower coverture can be reduced accordingly.Due to carbonization rice husk cost significantly
The cost less than lower coverture, so using carbonization rice husk reduce steel produce cost.
Carbonization rice husk, which is used alone, can increase the phosphorus content of steel as coverture, so being produced in low carbon low silicon steel
Carbonization rice husk will not be used in journey as coverture, and then make it that the production cost of low carbon low silicon steel is higher.But make simultaneously
With lower coverture and carbonization rice husk, molten steel and carbonization rice husk are completely cut off, prevented as lower floor's coverture by lower coverture
For carbonization rice husk to molten steel carburizing, carbonization rice husk can not be used as coverture in low carbon low silicon steel production process by solving
Problem, reduce the production cost of low carbon low silicon steel.
Continuous casting process of the embodiment provided by the invention based on 120 tons of converter system low-carbon low-silicon steel H08A, H08A
Low-carbon low-silicon steel control element is as shown in table 1, wherein C≤0.08%, Si≤0.03%.Upper coverture uses carbonization rice husk, under cover
Lid agent composition quality accounting is CaO 27-33%, SiO2 29-35%、Al2O3 9-13%、MgO 3-5%、C 2-4%、H2O≤
0.5%。
Table 1
| Element | C | Si | Mn | P | S |
| Content（%） | ≤0.08 | ≤0.03 | 0.35-0.60 | ≤0.025 | ≤0.025 |
Embodiment one：Molten steel is injected into tundish, after liquid steel level is highly more than 400mm, is added for the first time into tundish
Enter lower coverture, addition 250kg；After liquid steel level is steady, to the lower coverture of second of addition of tundish, addition is
100kg, lower coverture is set to be dispersed on liquid steel level；Carbonization rice husk is added on lower coverture surface, addition is
120kg, carbonization rice husk are dispersed in lower coverture surface.Carbonization rice husk addition is the 25% of coverture total amount.Contrast refining
Outbound molten steel and the control element in molten steel after continuous casting, as shown in table 2, the controlled quentity controlled variable of carbon and element silicon meets H08A steel
Standard, and carbon increasing amount ＜ 0.01%, but encrustation phenomena occurs around stopper in the phase after pouring.Lower coverture is effectively prevented
Carbonization rice husk carburizing into molten steel is stopped, but because carbonization rice husk content is less, coverture occurs under the casting cycle later stage
Encrustation phenomena, carbonization rice husk fade away to the insulation effect of lower coverture.
Table 2
| Element | C | Si | Mn | P | S |
| Refine outbound composition/% | 0.052 | 0.015 | 0.470 | 0.013 | 0.010 |
| Continuous casting samples composition/% | 0.058 | 0.018 | 0.048 | 0.015 | 0.012 |
Embodiment two：Molten steel is injected into tundish, after liquid steel level is highly more than 400mm, is added for the first time into tundish
Enter lower coverture, addition 270kg；After liquid steel level is steady, to the lower coverture of second of addition of tundish, addition is
120kg, lower coverture is set to be dispersed on liquid steel level；Carbonization rice husk is added on lower coverture surface, addition is
170kg, carbonization rice husk are dispersed in lower coverture surface.Carbonization rice husk addition is the 30% of coverture total amount.Contrast refining
Outbound molten steel and the control element in molten steel after continuous casting, as shown in table 3, the controlled quentity controlled variable of carbon and element silicon meets H08A steel
Standard, carbon increasing amount ＜ 0.01%, and the phase does not also occur encrustation phenomena around stopper after pouring.Lower coverture is effective
Carbonization rice husk carburizing into molten steel is prevented, and carbonization rice husk effectively maintains the temperature of lower coverture.
Table 3
| Element | C | Si | Mn | P | S |
| Refine outbound composition/% | 0.055 | 0.015 | 0.48 | 0.015 | 0.010 |
| Continuous casting samples composition/% | 0.060 | 0.019 | 0.046 | 0.014 | 0.011 |
Embodiment three：Molten steel is injected into tundish, after liquid steel level is highly more than 400mm, is added for the first time into tundish
Enter lower coverture, addition 290kg；After liquid steel level is steady, to the lower coverture of second of addition of tundish, addition is
140kg, lower coverture is set to be dispersed on liquid steel level；Carbonization rice husk is added on lower coverture surface, addition is
190kg, carbonization rice husk are dispersed in lower coverture surface.Carbonization rice husk addition is the 30% of coverture total amount.Contrast refining
Outbound molten steel and the control element in molten steel after continuous casting, as shown in table 4, the controlled quentity controlled variable of carbon and element silicon meets H08A steel
Standard, carbon increasing amount ＜ 0.01%, and the phase does not also occur encrustation phenomena around stopper after pouring.Lower coverture is effective
Carbonization rice husk carburizing into molten steel is prevented, and carbonization rice husk effectively maintains the temperature of lower coverture.
Table 4
| Element | C | Si | Mn | P | S |
| Refine outbound composition/% | 0.054 | 0.018 | 0.43 | 0.015 | 0.013 |
| Continuous casting samples composition/% | 0.061 | 0.024 | 0.45 | 0.016 | 0.014 |
Example IV：Molten steel is injected into tundish, after liquid steel level is highly more than 400mm, is added for the first time into tundish
Enter lower coverture, addition 300kg；After liquid steel level is steady, to the lower coverture of second of addition of tundish, addition is
150kg, lower coverture is set to be dispersed on liquid steel level；Carbonization rice husk is added on lower coverture surface, addition is
240kg, carbonization rice husk are dispersed in lower coverture surface.Carbonization rice husk addition is the 35% of coverture total amount.Contrast refining
Outbound molten steel and the control element in molten steel after continuous casting, as shown in table 5, the controlled quentity controlled variable of carbon and element silicon meets H08A steel
Standard, and the phase does not also occur encrustation phenomena, but carbon increasing amount ＞ 0.01% around stopper after pouring.Carbonization rice husk is effective
Maintaining under coverture temperature, but because carbonization rice husk content is larger, lower coverture can not be effectively prevented carbonization rice
Shell carburizing into molten steel, cause molten steel recarburization amount to exceed controlled quentity controlled variable, influence steel product quality.
Table 5
| Element | C | Si | Mn | P | S |
| Refine outbound composition/% | 0.051 | 0.017 | 0.48 | 0.017 | 0.015 |
| Continuous casting samples composition/% | 0.063 | 0.022 | 0.49 | 0.019 | 0.014 |
By above-described embodiment, it can be found that best results when upper coverture usage amount is coverture total amount 30%.Upper coverture energy
Enough effective temperature for keeping lower coverture, avoiding lower coverture, there is encrustation phenomena in the phase after pouring.Lower coverture can
Effectively upper coverture is completely cut off with molten steel, it is therefore prevented that go up coverture to molten steel carburizing.
Foregoing is to example embodiment for example, and being not necessarily to be construed as the limitation to example embodiment.Although
Some example embodiments have been described, but those skilled in the art will be readily understood that, not depart from this substantially
In the case of disclosed novel teachings and advantage, many modifications in example embodiment are possible.Therefore, it is all these
Modification is intended to be included in as defined by the appended claims within the scope of the present disclosure.It will be appreciated, therefore, that foregoing be
To various example embodiments for example, and should not be construed as limited to disclosed specific example embodiment, and
Modification to disclosed example embodiment and other example embodiments is intended to be included within the scope of claim.
Claims (8)
- A kind of 1. method for reducing tundish covering flux consumption, it is characterised in that including step：1）Molten steel is injected into tundish；2）Lower coverture is added into tundish, for keeping liquid steel temperature, secondary oxidation of steel is prevented, purifies molten steel；3）Upper coverture is added into tundish, for keeping the temperature of lower coverture, prevents lower coverture surface crust.
- A kind of 2. method for reducing tundish covering flux consumption according to claim 1, it is characterised in that the centre Liquid steel level in bag is highly more than 400mm；The liquid level refers to tundish bottom to the distance of liquid steel level.
- A kind of 3. method for reducing tundish covering flux consumption according to claim 1, it is characterised in that the step 2）Including：21）Lower coverture is added for the first time, and lower coverture is added from tundish middle part to tundish both sides；22）The lower coverture of second of addition, under being added in first time after coverture, treats that liquid steel level is steady, naked to liquid steel level Dew or lower coverture non-uniform areas supplement add lower coverture, to liquid steel level completely by lower coverture uniform fold.
- A kind of 4. method for reducing tundish covering flux consumption according to claim 1, it is characterised in that the overlying Lid agent usage amount is the 30% of the lower coverture and the upper coverture quality total amount.
- A kind of 5. method for reducing tundish covering flux consumption according to claim 1, it is characterised in that the overlying Lid agent is carbonization rice husk, C mass accounting 51.4%, Si0 in the carbonization rice husk composition2Quality accounting 27.2%.
- 6. a kind of method for reducing tundish covering flux consumption according to claim 1, it is characterised in that covered under described Lid agent composition quality accounting is CaO 27-33%, SiO2 29-35%、Al2O3 9-13%、MgO 3-5%、C 2-4%、H2O≤ 0.5%。
- 7. a kind of method for reducing tundish covering flux consumption according to claim 3, it is characterised in that described first The usage amount of coverture is 2-2.5kg/t under secondary addition；Described second usage amount for adding lower coverture is 0.8-1.25kg/ t。
- A kind of 8. method for reducing tundish covering flux consumption according to claim 1, it is characterised in that the overlying The usage amount of lid agent is 1.0-1.6kg/t.
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| CN86100805A (en) * | 1986-02-03 | 1987-01-31 | 中国科学院化工冶金研究所 | The heat preservation agent on surface, deposite metal |
| CN101347823A (en) * | 2008-09-11 | 2009-01-21 | 首钢总公司 | Method for using double-layer continuous casting pouring box covering agent |
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